RHEL 6 Migration - 9.4. Driver Changes

Red Hat Enterprise Linux 9 Essentials Book now available.

Purchase a copy of Red Hat Enterprise Linux 9 (RHEL 9) Essentials

Red Hat Enterprise Linux 9 Essentials Print and eBook (PDF) editions contain 34 chapters and 298 pages

9.4. Driver Changes

This section describes the driver changes in Red Hat Enterprise Linux 6. Please note that all drivers are now loaded to initramfs by default.

NBD - Network Block Device supplanted by iSCSI in Red Hat Enterprise Linux 6.
HFS - Apple filesystem support discontinued in Red Hat Enterprise Linux 6.
Tux - Web Server accelerator discontinued in Red Hat Enterprise Linux 6.
Non-PAE x86 kernel - Previous versions of Red Hat Enterprise Linux contained multiple kernels for the i686 architecture: a kernel with, and a kernel without PAE. It has been many years since non-PAE hardware was sold in volume. Hence in Red Hat Enterprise Linux 6, there will only be a single kernel, one that includes PAE.
The Anticipatory I/O scheduler is deprecated and is not present in Red Hat Enterprise Linux 6. It is replaced by the CFQ (Completely Fair Queueing) I/O scheduler, which has been the default I/O scheduler in the Linux kernel since 2006. Customers using the Anticipatory I/O scheduler are encouraged to test their workload using CFQ and file bugs for any performance issues observed. While the goal is to make CFQ perform on par with the Anticipatory I/O scheduler in all tested workloads, Red Hat cannot guarantee that there will be no outliers.